Question

what is a series of diffusion - facilitating membrane proteins found in the inner membrane of the mitochondria?
citric acid cycle
protein transfer
atp synthesis
electron transport chain

Explanation:

The electron - transport chain in the inner mitochondrial membrane consists of a series of membrane - bound proteins that facilitate diffusion of electrons and protons for ATP production. The citric acid cycle occurs in the mitochondrial matrix, protein transfer is a general process not specific to this context, and ATP synthesis is the end - result facilitated by the electron - transport chain.

Answer:

electron transport chain